无法从 firebase 云函数中的外部 api 读取 POST 响应正文

Question

I have a cloud function which makes an http POST request to the LinkedIn API in order to retrieve an access token. The problem is that I cannot read the body of the response, it's always undefined .

Here's the code

exports.linkedinToken = functions.https.onRequest((req, res) => {
    let url = "https://linkedin.com/oauth/v2/accessToken?...REQUIRED_PARAMS...";

    request.post(url, {json: true}, (err, response, body) => {
      if (!!err) { // this is never happening
        console.log(err);
        throw err;
      } else {
        console.log(response.body); // this is always undefined
        console.log(body); // this is always undefined
      }
});

If I try the same request with Postman or curl it works perfectly, and I cannot really understand why.

Before this request, I made another GET request to the linkedin API and it works normally. Maybe there's a problem with POST requests.

Answer 1

I think you are missing headers.

var request = require('request');
request.post({
  headers: {
    'content-type' : 'application/x-www-form-urlencoded',
    'cache-control' : 'no-cache'
  },
  url: url
}, function(error, response, body){
  console.log(body);
});